Unlock instant, AI-driven research and patent intelligence for your innovation.

Optical transmission apparatus, optical interface device, and optical transmission method

a technology of optical interface device and optical transmission apparatus, which is applied in the direction of digital transmission, multi-channel communication, wavelength-division multiplex system, etc., can solve the problems of noise generation, negative effect of live-line plug-in of plug-in optical device on integrated circuit, and concern for negative effect on cdr

Inactive Publication Date: 2009-12-03
FUJITSU LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to solve problems in conventional technology by providing an optical transmission apparatus with a connector and an optical interface device that can detect and respond to live-line plug-in of an optical device. The optical interface device includes a clock data recovery circuit, an internal bias voltage applying unit, a plug-in detector, and an external bias voltage applying unit. The apparatus can apply a higher voltage to the clock data recovery circuit when the optical device is detected as being live-line plugged in. This results in improved performance and reliability of the optical transmission apparatus.

Problems solved by technology

The above optical wavelength division multiplex apparatus, however, poses the problem that live-line plug-in of the pluggable optical device may exert a negative effect on an IC (Integrated Circuit) in the optical wavelength division multiplex apparatus.
Specifically, when the pluggable optical device is plugged into the optical wavelength division multiplex apparatus by live-line plugging, a noise may be generated on a voltage applied to a CDR (Clock Data Recovery) in the optical wavelength division multiplex apparatus before the startup of the pluggable optical device.
The generation of such a noise may push the applied voltage out of the range of an input rated voltage for the CDR, thus causing a concern for a negative effect on the CDR.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optical transmission apparatus, optical interface device, and optical transmission method
  • Optical transmission apparatus, optical interface device, and optical transmission method
  • Optical transmission apparatus, optical interface device, and optical transmission method

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0024]A configuration of a conventional optical wavelength division multiplex apparatus will first be described to clarify the features of an optical wavelength division multiplex apparatus of a FIG. 7 is a configuration diagram of a conventional optical wavelength division multiplex apparatus 9. As shown in FIG. 7, the optical wavelength division multiplex apparatus 9 includes an optical interface device 90, and an optical wavelength multiplexing / demultiplexing device 20.

[0025]The optical interface device 90 has a plurality of optical interface units 800, 900, . . . , n, as shown in FIG. 7. The optical interface unit 800 is an optical interface unit that is not compatible with a pluggable optical device, and has an MSA (Multisource Agreement) unit 810, a frame processing unit 820, and an MSA unit 830.

[0026]The MSA unit 810 converts an optical signal input from a client line into an electric signal to output the electric signal to the frame processing unit 820, and converts an elec...

second embodiment

[0068]FIG. 5 is an example of a schematic circuit diagram of an optical interface unit 200a incorporated in an optical wavelength division multiplex apparatus 2 according to the In the following description, the component units having the same functions as the component units of FIG. 2 will be denoted by the same reference numerals, and will be omitted in detailed description.

[0069]As shown in FIG. 5, a CDR 202 incorporated in the optical interface unit 200a has a pin 204 for applying a bias voltage that is disposed in the middle between terminal resistances 203a and 203b. The operational amplifier 103 is connected to this pin 204. As a result, the external bias voltage can be applied to the CDR 202 in the same manner as in the first embodiment.

[0070]As described above, the optical wavelength division multiplex apparatus 2 of the second embodiment is configured so that the external bias voltage applying circuit is connected to the pin 204 for applying the bias voltage. As a result,...

third embodiment

[0073]As described above, the optical wavelength division multiplex apparatus 3 of the third embodiment is configured so that the external bias voltage applying circuit is connected to the pins 304a and 304b for applying the bias voltage. As a result, without having an additional pin for connection of the external bias voltage applying circuit, the optical wavelength division multiplex apparatus 3 is able to prevent exertion of a negative effect on the CDR 302 even if a pluggable optical device is plugged in by live-line plugging.

[0074]Another aspect of the present invention is achieved effectively when the constituent elements of the optical transmission apparatus disclosed in this application, the described constitution of the optical transmission apparatus, or an arbitrary combination of the constituent elements are applied to a method, an apparatus, a system, a computer program, a recording medium, a data structure, etc.

[0075]The optical transmission apparatus disclosed in the p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

When an XFP is plugged into an optical interface unit by live-line plugging, an external bias voltage higher than an internal bias voltage is kept applied to a CDR incorporated in the optical interface unit until the XFP starts up. This prevents exertion of a negative effect on the CDR.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2008-138570, filed on May 27, 2008, the entire contents of which are incorporated herein by reference.BACKGROUND[0002]1. Field[0003]The present invention relates to an optical transmission apparatus, an optical interface device, and an optical transmission method.[0004]2. Description of the Related Art[0005]In recent years, an optical wavelength division multiplex (WDM) system is often used for an optical communication network. In the optical wavelength division multiplex system, a plurality of optical signals of different wavelengths are multiplexed and transmitted through one optical fiber cable. The optical wavelength division multiplex system includes a plurality of optical wavelength division multiplex apparatuses that are connected via an optical fiber cable.[0006]A certain type of optical wavelength division multiplex appa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): H04J14/02H04B10/2507H04B10/40H04B10/50H04B10/60
CPCH04J14/02H04L7/0083H04L7/0004
Inventor SATO, TOMOKOITOU, SUNAO
Owner FUJITSU LTD